GAS DIFFUSION ELECTRODE AND BRINE ELECTROLYTIC BATH

摘要

The invention relates to a gas diffusion electrode and a gas diffusion electrode and gas chamber which are suitable for use as an oxygen cathode of an ion-exchange type sodium chloride electrolytic cell, and the like, and a sodium chloride electrolytic cell using the same. The invention provides a gas diffusion electrode supported by a metal frame characterized in that the gas diffusion electrode is joined to the metal frame via a silver member or a member having a silver surface. The joints are leakproof against liquid and gas. No gasket is needed between the gas diffusion electrode and an electrolytic cell frame. The metal-framed gas diffusion electrode can be made large-sized by using a metal frame having two or more openings, to each of which a gas diffusion electrode is joined via a silver member or a member having a silver surface by hot pressing. The distance to an ion-exchange membrane can be reduced by shaping the metal frame in such a manner that the gas diffusion electrode supported thereon projects forward. A gas diffusion electrode and gas chamber which is tightly sealed against liquid is made by joining an electrode pan to the back side of the metal-framed gas diffusion electrode to form a gas chamber between that side and the electrode pan. An electrolytic cell is made by using the gas diffusion electrode and gas chamber.